Similarly, there's a healthy market for photographic prints made with the standard gelatin-silver and color "wet" or "chemical" methods, and even a thriving revival of the earlier alternative processes: platinum, cyanotype, tintype, ambrotype, daguerreotype, each with its own distinctive look and feel.

It also includes aspects of technology, culture, and physical phenomena that influenced the outcomes or documentation of the war, such as the early ambrotype photograph, influential newspapers, the practice on conscription, and the phenomenon of acoustic shadow.

Visitors will be able to view, for example, letters penned by George Washington, a copy of the Declaration of Independence in the handwriting of Thomas Jefferson, and ambrotype and daguerreotype images of Abraham Lincoln.

Also: Connoisseurs of Clay: Collecting Contemporary Ceramics; Untangling Intaglios and Other Print Processes Made Plain; and Jacob Lawrence: Toussaint L'Ouverture, all through July 24, as well as A is for Ambrotype, through Sept.

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